commit 5affd23e6f42125998724787025080a24839266e
author Serhiy Storchaka <storchaka@gmail.com> Wed Apr 05 09:37:24 2017 +0300
committer GitHub <noreply@github.com> Wed Apr 05 09:37:24 2017 +0300
tree 8b7ca82362e78a32805b117d574082d512251d3c
parent 43ba8861e0ad044efafa46a7cc04e12ac5df640e

bpo-29762: More use "raise from None". (#569)

This hides unwanted implementation details from tracebacks.

Lib/json/decoder.py

diff --git a/Lib/json/decoder.py b/Lib/json/decoder.py
index 2422c6a..3741dee 100644
--- a/Lib/json/decoder.py
+++ b/Lib/json/decoder.py
@@ -103,7 +103,8 @@
         try:
             esc = s[end]
         except IndexError:
-            raise JSONDecodeError("Unterminated string starting at", s, begin)
+            raise JSONDecodeError("Unterminated string starting at",
+                                  s, begin) from None
         # If not a unicode escape sequence, must be in the lookup table
         if esc != 'u':
             try: